fixed doc attr for actors, add documentation

MIGRATION.md

@@ -3,6 +3,8 @@
 * Setting a cookie's SameSite property, explicitly, to `SameSite::None` will now
   result in `SameSite=None` being sent with the response Set-Cookie header.
   To create a cookie without a SameSite attribute, remove any calls setting same_site.
+* actix-http support for Actors messages was moved to actix-http crate and is enabled 
+  with feature `actors`
 
 ## 2.0.0
 

actix-http/CHANGES.md

@@ -6,6 +6,8 @@
 
 * Update the `time` dependency to 0.2.7
 
+* Moved actors messages support from actix crate, enabled with feature `actors`.
+
 ### Fixed
 
 * Allow `SameSite=None` cookies to be sent in a response.

actix-http/Cargo.toml

@@ -15,7 +15,7 @@ license = "MIT/Apache-2.0"
 edition = "2018"
 
 [package.metadata.docs.rs]
-features = ["openssl", "rustls", "failure", "compress", "secure-cookies","actix"]
+features = ["openssl", "rustls", "failure", "compress", "secure-cookies","actors"]
 
 [lib]
 name = "actix_http"

actix-http/src/error.rs

@@ -953,10 +953,12 @@ impl ResponseError for fail_ure::Error {}
 
 #[cfg(feature = "actors")]
 /// `InternalServerError` for `actix::MailboxError`
+/// This is supported on feature=`actors` only
 impl ResponseError for actix::MailboxError {} 
 
 #[cfg(feature = "actors")]
 /// `InternalServerError` for `actix::ResolverError`
+/// This is supported on feature=`actors` only
 impl ResponseError for actix::actors::resolver::ResolverError {} 
 
 #[cfg(test)]